I found a video. lift up the trim on the ceiling. tuck the wire under the top of the door post trim, pull the rubber seal and tuck it into gap.Can you not plug directly into the USB in the armrest? If so, I was able to mount the camera under the rearview mirror and route and tuck the wire in the headliner, down the inner paneling at the door seal, under the glove compartment, along the underside of the center console, and up into the arm rest.
That sounds like a lot, but with a panel pulling tool (you really only need to use it to push) it goes quickly.